I don't think there is or ever will be such a thing as an external skinchanger. The main reason being, why would you make it externally if you could do the same internally, much, much easier? The architecture behind building an external skinchanger is just awfully stupid and hard to pull off consistently. Second reason: why would you do it externally in the first place? One of the biggest selling points of externals is that most of them don't write to process memory, which you will have to do regardless for a skinchanger, whether external or internal. If you're looking for a skinchanger in general, there is an outdated internal inventory changer here called Berserkchanger, but stop looking for external skinchangers; no one is going to make one, to be honest.